6407666 has 8 divisors (see below), whose sum is σ = 9943020. Its totient is φ = 3093328.

The previous prime is 6407591. The next prime is 6407671. The reversal of 6407666 is 6667046.

It can be written as a sum of positive squares in 2 ways, for example, as 6375625 + 32041 = 2525^2 + 179^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55181 + ... + 55296.

Almost surely, 2^6407666 is an apocalyptic number.

6407666 is a deficient number, since it is larger than the sum of its proper divisors (3535354).

6407666 is a wasteful number, since it uses less digits than its factorization.

6407666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110508.

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 6407666 is about 2531.3368009809. The cubic root of 6407666 is about 185.7376538079.

The spelling of 6407666 in words is "six million, four hundred seven thousand, six hundred sixty-six".